Structure for threading paper machine

ABSTRACT

A DEVICE FOR THREADING A PAPER MACHINE WHICH INCLUDES A PAIR OF CLOSED LOOP CARRIER MEMBERS MOUNTED ON A SERIES OF SUPPORTING ROLLS AND ARRANGED IN SUCH A WAY THAT A PAPER WEB MAY BE TRANSFERRED FROM ONE OF THE CARRIERS TO THE OTHER. ONE OFTHE CARRIERS MAY TAKE THE FORM OF A MOVING WIRE ONTO WHICH A PAPER WEB OR THE LIKE IS PLACED. THE WEB AND THE WIRE THAN MOVE CONTINUOUSLY TOGETHER UNTIL THE COMBINATION OF WIRE AND WEB COME IN CONTACT. WITH THE SECOND CARRIER WHICH MAY BE MADE OF FELT OR OTHER SIMILAR FLUID ABSORBENT MATERIAL. THE TWO CLOSED CARRIER LOOPS ARE MOVED INTO PROXIMITY WITH ONE ANOTHER SUCH THAT THE PAPER WEB TRAVELING ALONG WITH THE FIRST CARRIER MAY BE READILY TRANSFERRED TO THE SECOND CARRIER AND MOVED ONWARD TO FURTHER MACHINE PROCESSING STAGES. THE FELT CARRIER IS PROVIDED WITH A ROLL WHICH IS ROTATABLY MOUNTED AND WHICH URGES THE FELT CARRIER INTO CONTACT WITH THE WIRE CARRIER. THE WIRE CARRIER HAS A ROLL WHICH IS ROTATABLY MOUNTED ON A PIVOT ARM WHICH MAY BE PIVOTED TO MOVE THE ASSOCIATED WIRE CARRIER INTO AND OUT OF PROMIXITY WITH THE ADJACCENT FELT CARRIER. THE PIVOTALLY MOUNTED ROLL IS SUPPORTED RADIALLY INWARDLY OF THE LOOP FORMED BY THE ASSOCIATED WIRE CARRIER SUCH THAT PIVOTAL MOVEMENT OF THE ROLL WILL ATTEMPT TO SLACKEN THE LOOP. A FURTHER ROLL IS MOUNTED EXTERIORLY OF THE LOOP IN SUCH A WAY AS TO TAKE UP THE SLACK WHICH IS DEVELOPED BY THE PIVOTAL ACTION OF THE PIVOTALLY MOUNTED ROLL.

June 19, 1973 D. c. CRONIN 3,740,312

STRUCTURE FOR THREADING PAPERMACHINE Filed Oct. 1, 1971 IN vim-"mu, Q,Dav/W5 C [kc/w United States Patent Office U.s. C1. 162--306 11 ClaimsABSTRACT OF THE DISCLOSURE A device for threading a paper machine whichincludes a pair of closed loop carrier members mounted on a series ofsupporting rolls and arranged in such a way that a paper web may betransferred from one of the carriers to the' other. One of the carriersmay take the form of a moving wire onto which a paper web or the like isplaced. The web and the wire then move continuously together until thecombination of wire and web come in contact with the second carrierwhich may be made of felt or other similar fluid absorbent material. Thetwo closed carrier loops are moved into proximity with one another suchthat the paper web traveling along with the first carrier may be readilytransferred to the second carrier and moved onward to further machineprocessing stages. The felt carrier is provided with a roll which isrotatably mounted and which urges the felt carrier into contact with thewire carrier. The wire carrier has a roll which is rotatably mounted ona pivot arm which may be pivoted to move the associated wire carrierinto and out of proximity with the adjacent felt carrier. The pivotallymounted roll is supported radially inwardly of the loop formed by theassociated wire carrier such that pivotal movement of the roll willattempt to slacken the loop. A further roll is mounted exteriorly of theloop in such a way as to take up the slack which is developed by thepivotal action of the pivotally mounted roll.

BACKGROUND OF THE INVENTION The field of art to which this inventionpertains is paper machines and in particular to means for threading apaper web or the like from a first moving wire carrier to a secondcarrier.

It is a principal feature of the present invention to provide animproved apparatus for threading a paper machine.

1 It is another feature of the present invention to provide an improvedmeans for transferring the path of a moving web from a first web carrierto a second independent carrier.

It is an important object of the present invention to provide animproved structure for threading a moving paper web or the like betweena pair of adjacent rolls associated with independent web carrierstructures.

It is also an object of the present invention to provide a device forthreading a paper machine which includes a pair of carrier loops whereineach of the carriers have at least one roll for urging the carrier intoproximity with the opposing carrier loop to enable the transfer of amoving web from one of the carriers to the other, and hence to a furthermachine operation stage.

It is another object of the present invention to provide a wire carrierfor a paper web having a pivotally mounted roll for urging a portion ofthe wire carrier and its associated paper web or the like into proximitywith a felt or water absorbent carrier.

It is an additional object of the present invention to provide athreading device for a paper machine as described above wherein thepivotally mounted roll is supported radially interiorly of theassociated carrier loop such that the loop would normally tend toslacken as the roll is pivoted about its pivot point.

3,740,312 Patented June 19, 1973 It is another object of the presentinvention to provide a paper threading device as described above whereina further roll is provided exteriorly of the wire carrier to take upslack which would otherwise be created in the carrier as the pivotallymounted roll is moved from one position to another.

It is still another object of the present invention to provide a devicefor threading a paper machine which includes means for altering theconfiguration of a closed wire carrier loop by means of a pivotallymounted roll wherein the roll is provided with an extension arm andwherein the extension arm is pivotally supported radially interiorly ofthe associated closed carrier loop to allow for maximum swing of theroll during pivotal movement of the extension arm.

These and other objects, features and advantages of the presentinvention will be understood from the following description and theassociated drawing wherein reference numerals are utilized to designatean illustrative embodiment.

BRIEF DESCRIPTION OF THE DRAWING The single drawing of the presentinvention is a schematic illustration of a portion of a paper machineaccording to the present invention and illustrates in detail thepresence of the separate or independent carrier loops and the means fortransferring a paper web from one of the carriers to the other carrierand particularly illustrating in detail the pivotally mounted roll foraltering the configuration of one of the carrier loops in order toengage and disengage the two carriers from a contacting relationshipwith each other.

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the presentinvention, a paper web is formed on a moving wire carrier. The carrieritself moves in a continuous closed path, and the paper web moves fromthe first carrier to a further carrier and from that point to subsequentmachine operation stages. The second carrier which is formed of felt orother fluid absorbent material is also moved in a continuous closedloop, and the loops of the two carriers are moved into proximity witheach other by means of properly positioned rolls. The felt carrier has aroll known as the pickup roll which moves a portion of the felt carrierinto proximity with the wire carrier. The wire carrier has a pivotallymounted roll which alters the configuration of the closed wire loop tomove the wire carrier into and out of engagement with the felt carrier.This allows the paper web which is initially supported on the wirecarrier to be fed between the wire carrier and the felt carrier at thepoint of engagement of the two. Of course, adjustment of one of thesupporting rolls of a closed loop tends to either increase or decreasethe slack in the closed carrier. Accordingly, an additional roll isprovided about which the configuration of the wire carrier loop may bealtered without developing slack.

The drawing of the present invention has been greatly simplified for thepurpose of explanation. The various means, of course, to support therolls are well known in the art and need not be described in detail. Itis understood that the rolls indicated in the schematic drawing of thepresent application are generally of a substantial size having a lengthwhich is much greater than their respective diameters.

Referring to the drawing in detail, a source of pulp solution or othermaterial is indicated generally by the reference numeral 10. The viscousmaterial is fed through an outlet 11 to a space 12 which is formedbetween an outer looped forming wire 13 and a Fourdrinier formingcarrier wire 14. The forming wire 13 moves over and around a roll 15 asshown at 16 and beneath a larger forming breast roll 17 commonly knownas a breast roll. The wire 13 then passes over a further roll 18 as at19. The looped Fourdrinier wire 14 is preferably of a light plasticwoven wire.

The web of material is formed between the forming wire 13 and the wirewhich, as shown in the drawing, moves in a continuous loop. Both theouter wire and the Fourdrinier carrier Wire pass together around thebreast roll 17, and at the point 20, the carrier Wire 14 and the outerwire 13 diverge with the web W traveling along with the Fourdrinier wire14 to a subsequent machine operation stage.

During the web forming stage just described, water thrown through thewire 13 is retained in a saveall pan 21. Also, water may be takeninwardly of the porous breast roll 17 through suction applied at thecenter thereof. For this purpose, the forming roll 17 may have a poroussurface to allow the pulp solution to be drawn inwardly therethroughinto a suction gland 17a.

The combination of the wire 14 and the web W then moves in a directionindicated generally by the arrow 22 past a suction box 23 or otherdrainage means. The suction box 23 assists in removing additional waterthrough the wire 14 and thereby assists in the proper formation of auniform web on the traveling wire.

The wire 14 and its associated web then pass over a guide roller 24within the wire loop. A guide roller 25 is provided outside the wireloop, and the combination of the guide rollers 24 and 25 maintain thegeneral configuration of the wire loop during the pivotal action of thepivot couch roll 26 of the present invention. This tension in the wire14 will remain so it can keep traveling at relatively high speed evenwhen the couch roll 26 is dropped.

The pivot couch roll of the present invention is indicated generally bythe reference numeral 26 and is provided with an extension arm 27 whichsupports the roll on the axis 28 at a pivotal mount 29. As shown, thepivotal mount 29 is disposed radially inwardly of the closed loop formedby the wire 14. The wire 14 passes around the exterior of the roll 26and beneath the roll 25 as shown in the drawing.

The dotted line illustrates the alternate down or dump position of thepivotal roll 26. The roll 26 is moved to the dump position with breakageof the web or on occasion when the web is to be dumped into the brokepit. When the roll 26 is pivoted to the down position, the wire 14passes around the rolls 24 and 25 such that the wire 14 does not losesubstantial slack during the pivotal operation. A suitable poweroperator such as an air cylinder is provided for pivoting roll 26.

As will be understood, the paper web leaves the wire 14 at the point 30,and the wire -14 continues around the exterior of the roll 26 andbeneath the roll 25 to the point 31 where it passes between a roll 32and a grooved roll 33. The combination of these rolls removes excessfluid which is remaining on the wire. Excess fluid is then captured in abasin or other similar container 34. The wire 14 then moves past asubsequent roll 35 and returns to its starting position against theFourdrinier wire 13 and the surface of the breast roll 17. As shown, adoctor blade 36 is provided in conjunction with the roll 35 to removeexcess fluid from the roll surface which may gather thereon from thewire and which has escaped removal prior to that point. The functioningof the doctor blade 36 and a further doctor blade 37 which is similarlyassociated with a roll 25 is well understood in the art.

The wire 14 passes against a felt 38 which also moves in a continuousand closed loop as shown in the drawing. The felt carrier passes aroundthe outside surface of a pickup roll 39. The perforate pickup roll 39has a suction gland 39a therein. A doctor blade 40 is associated withthe pickup roll 39. A catch pan or basin 41 is provided beneath thedoctor blade 40 to receive fluid therefrom in a well understood manner,

The felt carrier 38 then passes against a drum 42 commonly referred toas a Yankee drier. At the point 43, the paper web or the like separatesfrom the wire carrier and moves along the surface of the drum to beproperly dried and further processed. A grooved roll 44 is provided toestablish a nip with the Yankee drier 42 and to remove excess fluid fromthe felt carrier. A catchall pan or basin 45 similar to the pans 34 and41 is provided to receive excess fiuid from the grooved roll 44. Thefelt carrier 38 then passes against a series of guide rollers 46, 47 and48 and finally passes between a pair of rollers 49 and 50. The roller 50is also a grooved roll and is similar to the grooved rolls 33 and 44 andfunctions in the same manner. A saveall pan 51 is also provided toretain fluid which is removed at the grooved roll 50.

In summary, the structure of the invention may be set forth in termsrelating to a paper making machine as inincluding a traveling wire 14supported in a continuous loop, with means for forming a web of materialon the wire including the slice 11 and the breast roll 11 with the wireand web moving together along the upper forming run which encompasses aportion of the loop traveled by the wire. The structure further includesa traveling fluid absorbent type carrier or felt 38 which is supportedin a second continuous loop and has means including the pick up roll 39for causing the web to move together with the felt along a portion ofits loop. The structure further has roll means associated with each ofthe loops urging the two carriers 14 and 38 into proximity with eachother, which rolls include the pickup roll 39 and the couch roll 29. Thecouch roll is pivotally mounted to urge the wire 14 into proximity withthe felt 38 or to move it away from the felt.

Therefore, an apparatus is provided which utilizes a pair of carrierloops disposed in such a way to be in proximity with each other andwhich utilizes a pivotally mounted roll supported radially inwardly ofone of the carriers in such a way as to alter the loop configuration andallow for threading of the paper or other web-like material between theadjacent surfaces of the two carriers.

I claim as my invention:

1. A device for threading a moving web of material from a first carrierto a second carrier comprising:

a first roll,

means of continually moving said first carrier against the surface ofsaid first roll,

a second roll having an axis which is movable relative to the axis ofsaid first roll and being positioned immediately adjacent to said firstroll,

means for translating the axis of said second roll in such a manner asto move the surface of said second roll toward and away from the surfaceof said first roll,

said first and second carriers passing between said first and secondrolls during the respective movements thereof,

means for maintaining a web of material against said second carrierprior to the movement thereof between said first and second rolls, andmeans for maintaining said web of material against said first carrierafter the movement thereof between said first and second rolls.

2. A device in accordance with claim 1 wherein said second roll ispivotally supported relative to said first roll allowing said firstcarrier to be moved into and out of engagement with said second carrierin dependence on the pivotal position of said first roll.

3. A device in accordance with claim 2 wherein said second roll has anextension arm supporting the same and wherein said extension arm has apivotal support allowing said second roll to pivot relative to saidfirst roll.

4. In a web forming apparatus,

first and second carriers,

a plurality of rolls supporting each of said first and second carriersin independent closed paths,

one of said rolls associated with supporting said first carrier andanother of said rolls associated with supporting said second carrierurging a portion of each of said closed carriers into proximity witheach other,

said one roll being rotatably mounted and maintaining its associatedcarrier in a relatively fixed configuration, and

said second roll being rotatably mounted and being movably supported toalter the configuration of its associated carrier for moving the sameinto and out of proximity with the carrier path of said one roll.

5. A device in accordance with claim 4 wherein said second roll ispivotally supported and shifts the configuration of its carrier pathinto and out of proximity with the opposing carrier during pivotalmovement thereof.

6. A device in accordance with claim 5 wherein said second roll ispivotally supported inwardly of the closed carrier path associatedtherewith.

7. A device in accordance with claim 6 wherein a further roll isprovided adjacent to the carrier path associated with said pivotalsecond roll and wherein said further roll is positioned to take up slackin the carrier path during pivotal movement of said second roll.

8. In a web forming apparatus,

a traveling wire carrier supported in a continuous loop,

means for forming a web of material on said wire and moving the wire andweb together along a portion of the loop traveled by said wire,

a traveling fluid absorbent type carrier supported in a secondcontinuous loop and means for causing the web of material to movetogether with said fluid absorbent carrier along a portion of the looptraveled by the same,

roll means associated with each of said loops and urging the twocarriers into proximity with each other, and

one of said roll means being pivotally mounted to urge a portion of oneof said loops into and out of proximity with the other of said loops.

9. A device in accordance with claim 8 wherein said one roll means issupported radially inwardly of its associated loop such that pivotalmovement thereof tends to slacken said loop.

10. A device in accordance with claim 9 wherein a further roll isprovided radially outwardly of the loop associated with said one rolland wherein said further roll is positioned to take up slack in saidloop during pivotal movement of said one roll.

11. In a web forming apparatus the combination comprising,

a traveling looped continuous forming wire,

means for forming and dewatering a web on the wire,

a couch roll positioned within the wire and movable between a firstnormally operating position and a second dump position,

a pickup roll associated with the wire for removing the web from thewire adjacent the couch roll, and support rolls for the wire positionedso that the wire will remain taut in both positions so that the wire cancontinue traveling when the couch roll is moved to the down position todump the web into a broke pit.

References Cited UNITED STATES PATENTS 2,622,492 12/1952 Goodwillie226-91 X 3,207,658 9/1965 Lamb 22691 UX 3,595,745 7/1971 Cronin 226-9lUX RICHARD A. SCHACHER, Primary Examiner G. A. CHURCH, AssistantExaminer US. Cl. X.R. 226-91 FORM PO-1050(10-69) UNITED STATES PATENTOFFICE CERTIFICATE OF CORRECTION Patent No. 5,7 ,5 Dated June 9, 975

Inven Dennis C. Cronin It is certified that error appears in theabove-identified patent and that said Letters Patent are herebycorrected as shown below:

Column i, line 57, "second" should read first line 59, "first" shouldread second line 67, "first" should read second Signed and Sealed thisninth D ay Of September 1975 [SEAL] Attesl:

RUTH C. MASON Arresting Officer C. MARSHALL DANN (ummissiimer ufParentsand Trademurkx USCOMM-DC 60376-P69 u.s GOVERNMENT PRINTING OFFICE: 369930

